the optical assy is a large amount of work i wouldnt recomend doing it yorslf at all. please leave that to the pros. you have to completely disassemble the tv from the back. i can do it myself in about 45 min.

Authorized sony repair center told me the problem was the Q Box. Ever
heard of this? Part runs about 300 bucks. TV is out of warrenty as it
is 2 years old. Do you think it is worth it to fight sony and get them
to replace the part or just fix the TV?

Part Number is A1167541A, service rep called it a Q Box in the diag, however the web says its the b block assmy.

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you will need a new one of these sony optical block 1-788-303-21 kdf-e50a10. when it over heats the picture will go strange also just sometimes there is a build up of dust blocking the light in the chamber in the optical block you may be able to clean this out but any scratches you make on the glass will be seen when the tv is on. also there is a lot of resting to do when you put back you have to re-aline the output to the screen size using the adjuster.

It is an Optical Block Problem, Sony has settled several Class Action Lawsuits covering many models from 2002-2010. Start with this Link, it will provide you a very good starting point. Hope this helps

It is dlp tv that has one lamp as back light source. Yellowish tint is problem of Optical Block Unit (commonly known as light engine) that will be replaced to fix it.Local tech will help you in optical block unit replacement because it is purely job of qualified tech.Thanks.

This is caused by a failure of the optical block of your TV. The only way to fix the issue is to replace the whole optical block which is very expensive ($1000+) and time consuming (need to take whole TV apart to replace the part).

The optical block in your model had inherent issues and there is currently a class action lawsuit pending against Sony for this issue. Up to date information reguarding the lawsuit can be found here: http://www.sonya20tvclassaction.com/main/home.sfx